满分5 >
高中数学试题 >
在△ABC中,a=80,b=100,A=45°,则此三角形解的情况是( ) A....
在△ABC中,a=80,b=100,A=45°,则此三角形解的情况是( )
A.一解
B.两解
C.一解或两解
D.无解
考点分析:
相关试题推荐
数列1,a,a
2,a
3,…,a
n-1,…,的前n项的和为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722009_ST/2.png)
D.以上均不正确
查看答案
不等式3x+2y-6<0表示的平面区域是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722008_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722008_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722008_ST/images2.png)
D.
查看答案
已知实系数一元二次方程x
2+(1+a)x+a+b+1=0的两个实根为x
1,x
2,且 0<x
1<1,x
2>1,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722007_ST/0.png)
的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722007_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722007_ST/3.png)
D.
查看答案
过椭圆左焦点F且倾斜角为60°的直线交椭圆于A,B两点,若|FA|=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722005_ST/0.png)
|FB|,则椭圆的离心率等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222823010072229/SYS201311012228230100722005_ST/3.png)
D.
查看答案